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Note 16 - Employee Benefit Plans - Components of Pension Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Service cost $ 6 $ 6
Interest cost on projected benefit obligation 1,518 1,675
Net amortization of actuarial loss 693 664
Expected return on plan assets (1,813) (1,971)
Net periodic benefit cost $ 404 $ 374